Fix exception when permission denied on symlinks

[avdv]

Description

Thanks for contributing this Pull Request. Add a brief description of what this Pull Request does. Do tag the relevant issue(s) and PR(s) below. If required, add some screenshot(s) to support your changes.

• Relevant Issues : Cannot list files/directories with spaces using -l flag #338
• Relevant PRs : (none)
• Type of change :
  • New feature
  • Bug fix for existing feature
  • Code quality improvement
  • Addition or Improvement of tests
  • Addition or Improvement of documentation

Sorry, no test case as I failed to stub File.readlink successfully.

[codecov-io]

Codecov Report

Merging #340 into master will decrease coverage by 0.31%.
The diff coverage is 37.5%.

@@            Coverage Diff             @@
##           master     #340      +/-   ##
==========================================
- Coverage   89.06%   88.75%   -0.32%     
==========================================
  Files           8        8              
  Lines         494      498       +4     
==========================================
+ Hits          440      442       +2     
- Misses         54       56       +2

Impacted Files	Coverage Δ
lib/colorls/core.rb	89.4% <0%> (-0.42%)	⬇️
lib/colorls/fileinfo.rb	77.77% <50%> (-1.02%)	⬇️

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